Specular and Diffuse Reflectance Standards

Reflectance measurements are a ratio of the reflected light spectrum to the incident light spectrum. Since there is no way to directly collect all of the light incident on a surface, reflectivity is usually measured relative to a reference standard. To ensure best results, the standard selected should be similar in reflectivity to the sample to be measured.

Ocean Optics offers specular reflectance standards for measuring shiny surfaces such as machined metals and semiconductor materials and low-reflectivity surfaces such as anti-reflective coatings and thin film coatings. Add a STAN-HOLDER to keep your standards in place and to protect their coatings.

Specifications	STAN-SSH	STAN-SSH-NIST	STAN-SSL	WS-1	WS-1-SL	STAN-HOLDER
Description	Specular reflectance standards for measuring shiny surfaces	Version of STAN-SSH calibrated to a NIST master standard The NIST calibration data range is 250-2400 nm.	Specular reflectance standards for measuring low-reflectivity surfaces such as anti-reflective coatings and thin film coatings	Diffuse reflectance standard using Lambertian material distinguished by its white matte finish	Diffuse reflectance standard using Spectralon. Use it for field work or unclean environments. The Spectralon diffusing material can be smoothed, flattened and cleaned if it gets pitted or dirty.	Holds reflectance standards in place and helps preserve their coatings
Reflectance Material	Front surface-protected aluminum mirror on fused silica substrate	Front surface-protected aluminum mirror on fused silica substrate	Schott ND9 glass	PTFE	Spectralon	–
Reflectivity	~87%-93% (200 – 1000 nm) ~93%-98% (1000 – 2500 nm)	~87%-93% (200 – 1000 nm) ~93%-98% (1000 – 2500 nm)	~5% (200 – 950 nm) ~4% (950-2500 nm)	>98% (250-1500 nm) >95% (250-2200 nm)	>99% (400-1500 nm) >95% (250-2500 nm)	–
Spectral Range	200-2500 nm	250-1100 nm	200-2500 nm	200-2000 nm	250-2000 nm	–
Dimensions (Housing)	38 mm outer diameter x 19 mm height	38 mm outer diameter x 19 mm height	38 mm outer diameter x 19 mm height	38 mm diameter	32 mm OD 10 mm thick (tile)	–
Housing Material	–	–	–	Aluminum	Delrin	–
Dimensions (Substrate)	31.75 mm outer diameter x 6.35 mm height	31.75 mm outer diameter x 6.35 mm height	31.75 mm outer diameter x 6.35 mm height	–	10 mm thick	–
Weight	40 g	40 g	40 g	30 g	30 g	–